Internal-combustion engine poppet valve cooling



23, 1952 I D Y 2,611,348

INTERNAL-COMBUSTION ENGINE P OPPET VALVE COOLING Filed May 8, 1950 mvzmon FRANK EADES LINDSAY Patented Sept. 23, 1952 A z r n E. Lindsay, Birmingham, England, Signor to The Austin MotpnGompanyLimited;

' L.fFiimies iz ile e "maintainers, 195 o," scriai so. 160,tl48

In Great Britain May 16, 1949 6 Claims. (Cl. 12341.16)

1 2 This invention relates to internal combustion In passing through the narrow clearance be-' en e poppet valves and more particularly to the tween the displacement rod 5 and the cavity wall m ans mp y d f r coolin su h valv sthe cooling medium has considerable relative t has already been p p 13 provide p pp velocity and this gives very good conditions for valves with a sealed hollow stem containing a heat transfer which is enormously increased by OOO l qu d a Cooling e 1 as the movement between the cooling medium and s dium. wh is in a flu d r l quid state a 1 the internal surface of the valve stem which dissierating temperatures- The cooling mediu doe pates heat to the valve guide 1 and the water in the not fill the valve stem cavity and is displaced jacket 3, I a modification employing air 0001. from end to end thereof as the valve reciprocates 10 m instead of water li th lower end of so that it serves to transfer heat from the valve the valve stem may be formed with fins for dishead to the valve Stem Which ay Wo in a sipating the heat transferred through it from the water-cooled guide. upper or head end by the displaced cooling me- In a poppet valve according to the present indium in the valve stem cavity. vention, a fluid or liquid cooling medium con- 15 Obviously it is desirable that the displacement tained within a sealed hollow valve stem is posimember or rod shall be as long as possible, contively displaced from end to end of the valve sistent with leaving end clearances sufiicient to stem cavity by a displacement member which is accommodate the displacement and lag, so that free to move therein and which, owing to the inthe narrow all-round clearance between'such rod ertia effect, lags behind the'movement of the andthe cavity wall will be of considerable length. valve, a clearance, preferably of considerable Having fully described my invention, what I length, being afforded between the displacement claim and desire to secure by Letters Patent is: member and the wall surface of the valve stem 1. An internal combustion engine poppet valve cavity for the passage of the displaced cooling having a sealed hollow valve stem containing a medium. fluid medium and a displacement member, said An embodiment of the invention is shown, by member being solid in transverse cross section at W y Of p in the a pa y drawings least throughout a portion thereof, and free to of an internal combustion engine poppet valve move in the valve stem hollow and which, owing and its operating cam and tappet, the valve head to the inertia efiect, lags behind the valve moveand the majorportion of its stem being in section ment so as to displace said cooling medium to show the internal construction. around the periphery of said member as the valve Referring to the drawing, the valve is formed reciprocates. with a cavity l which is closed at its upper end 2. An internal combustion engine poppet valve by a screwed-in sealing plug 2 and extends from as claimed in claim 1, wherein there is afforded the valve head 3 l n itudina ly thr u h t valv between the displacement member and the wall Stem 4 al ost '00 t e lower ppet end thereof. surface of the valve stem cavity a clearance of A displacement member 5 in the form of a metal considerable length for the passage of the disrod with rounded ends is housed in the valve stem placed cooling medium.

cavity I, and this displacement member or rod 8. An internal combustion engine poppet valve 5 is shorter than th said av ty l a d is f u h 40 as claimed in claim 1, wherein the displacement cross-sectional area as to afiord a through allmember is in the form of a rod somewhat shorter round clearance between it and the wall of the than the length of the valve stem hollow and of cavity. The remainder Of the Space within the such cross-sectional area as to afford a through valve stem is filled with a fluid or liquid cooling all-round clearance between it and the wall of medium 6. The valve stem 4 works in the usual said cavity to permit the free displacement theretubular guide 1 which is cooled by the surroundthrough of the cooling medium from one end of ing water jacket 8. the hollow to the other in either direction ac- As the valve is reciprocated at speed by the cording to the direction of movement of the valve. cam 9 and tappet ID, the displacement member 4. A poppet valve for internal combustion enor rod 5 moves freely in the valve stem cavity I gines comprising an elongated stem having an but, owing to the inertia efiect, lags behind the elongated closed cavity, a fluidizable substance valve movement and thereby displaces the coolwithin said cavity, an elongated displacement ing medium 6 from one end of the cavity l to the member relatively movable within said cavity other and through the clearance in either direcwhereby said substance will be caused to pass tion according to the direction of movement of from one end of said cavity to the other end the valve. thereof in contact with the wall thereof, said displacement member being solid in transverse cross section at least throughout a portion thereof and being completely closed at one end thereof.

5. In a poppet valve having an elongated stem with an elongated closed cavity, the improvement comprising an elongated solid displacement member within said cavity, said elongated displacement member being shorter than said cavity and movable longitudinally therein, a fluidizable substance within said cavity surrounding said displacement member.

6. A poppet valve comprising a stem having an elongated closed cavity, a rod 01 smaller dimensions and said cavity movably mounted in said rounding said rod, said rod being substantially solid whereby the fluidizable substance moves from one end of the cavity to the other end as said rod moves within said cavity, said fluidizable substance serving to transfer heat from one portion of said valve to another portion thereof.

FRANK E. LINDSAY.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Name Date Possenti Jan. 23, 1940 

